单项选择题

While remembering mainly for the invention of the telephone, Alexander Graham Bell devoted his life to helping the deaf.()

A. remembering
B. for
C. to
D. helping the deaf

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单项选择题
I'm old enough not to let my troubles to interfere with my work.()

A. old enough
B. not
C. to interfere
D. with
单项选择题
The young man admitted to make errors in iudgment on more than one occasion.()

A. to make
B. in iudgment
C. on
D. occasion.
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